The French press is used to brew coffee by adding ground beans and hot water in a cylindrical pot and then pushing a screen down over the grounds using a plunger.

Starbucks has received eight reports in the U.S. of the plunger’s knob breaking, and one report from Canada, according to the CPSC. Once the knob is broken, users could cut themselves.

Consumers should immediately stop using the recalled French presses and contact Starbucks for instructions on how to return the product to receive a store credit, the CPSC said. The presses cannot be returned in stores.